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Gas migration monitoring device and monitoring method based on annulus pressure differential measurement while drilling

A measurement-while-drilling, annular pressure difference technology, applied in measurement, earthmoving, wellbore/well components, etc., can solve problems such as defects affecting gas invasion discovery and effective prevention, real-time and accuracy, and achieve operational Low professional requirements, high degree of automation, good stability

Active Publication Date: 2016-12-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0003] Although various gas intrusion monitoring technologies are relatively mature, the current gas intrusion and overflow monitoring technologies have obvious defects in real-time and accuracy, which affect the timely detection and effective prevention of gas intrusion

Method used

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  • Gas migration monitoring device and monitoring method based on annulus pressure differential measurement while drilling
  • Gas migration monitoring device and monitoring method based on annulus pressure differential measurement while drilling
  • Gas migration monitoring device and monitoring method based on annulus pressure differential measurement while drilling

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Embodiment 1

[0050] Such as figure 1 As shown, when the drill bit 7 encounters the high-pressure gushing formation 5, the high-pressure fluid in the formation will flow into the casing annulus 3 under the action of the negative pressure difference between the formation pore pressure and the bottom hole pressure, and flow through the casing annulus Gas invasion monitoring subsection 9 in 3. At this time, if the overflow is not detected in time and effective preventive measures are taken, the volume of the formation invasion fluid will expand rapidly when it rises to close to the wellhead, resulting in well kicks and blowouts. Occurrence of dangerous drilling accidents.

[0051] For this situation, if Figure 4 As shown in Fig. 1, the gas kick monitoring device based on annular pressure difference measurement while drilling monitors gas kick during drilling, and the steps are as follows:

[0052] S1, Bottom hole annular pressure P 1 ,P 2 and Well Depth H Measurement While Drilling and Fe...

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Abstract

The invention belongs to the technical field of petroleum engineering, and particularly relates to a gas migration monitoring device based on annulus pressure differential measurement while drilling in the drilling process. The gas migration monitoring device based on annulus pressure differential measurement while drilling comprises a nipple for gas migration monitoring while drilling, a central processing unit and a computer terminal; the two ends of the nipple for gas migration monitoring while drilling are connected with a drill collar and a drill pipe, and the two ends of the central processing unit are connected with a gas migration monitoring device body and the computer terminal; the computer terminal sends a measuring signal to the central processing unit through a data connection bus, the measuring signal is transmitted to the nipple for gas migration monitoring while drilling through an armored cable, a sensor group immediately conducts measurement work, the pressure P, the temperature T and the depth H of a corresponding position are obtained, the actual drilling fluid density is obtained through calculation, and if a difference between the actual drilling fluid density and theoretical density is larger than a gas migration discriminant value, well control prevention measures are started. The gas migration monitoring device is high in monitoring accuracy and extremely high in real-time performance, matching with the drill pipe is simple and convenient, the professional requirement on operation is low, the stability is good, and the automation degree is high.

Description

technical field [0001] The invention relates to the technical field of petroleum engineering, in particular to a gas invasion monitoring device while drilling and a monitoring method thereof based on annular pressure difference while drilling measurement during drilling. Background technique [0002] As oil and gas exploration and development gradually extend to the deep sea, the special submarine geographical environment such as shallow gas and shallow flow in the South China Sea and other deep water environments and harsh environmental conditions have increased the difficulty of deep water drilling. , when the drill bit encounters a high-pressure gas layer, formation fluids such as natural gas enter the drilling fluid in the annular space under the action of the unbalanced negative pressure difference, and continue to rise, diffuse and expand along the annular space, which is a phenomenon of deep water or deep well drilling Accidents often encountered in the process. When...

Claims

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Application Information

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IPC IPC(8): E21B47/12E21B47/06E21B47/07E21B47/04E21B21/08
CPCE21B21/08E21B47/04E21B47/06E21B47/12E21B47/07
Inventor 李庆超丁前孙宝江赵天华李昊
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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